Cold closed link anvil



June 22, 1954 E. T. MONTGOMERY 2,681,546

COL-D CLOSED LINK ANVIL Filed Oct. 8. 1951 I NVEN TOR.

fdaz'e ffiwnyomery Patented June 22, 1954 UNITED STATES TENT OFFICE 1 Claim.

This invention relates to anvils in the form of jigs used for holding articles of specific design, and in particular a comparatively small anvil having U-shaped grooved sockets in the ends for holding a repair link used in connecting parts of chains of the type wrapped around a stand of pipe of 'a rotary drilling rig where the straight end of the link is riveted or peened over the outer surface of an eye through which the straight end extends for closing the. link.

The purpose of this invention is to provide means for repairing Well pipe fitting chains in the field whereby repair links may be secured in fixed positions for brading or swedging.

In the conventional method of repairing broken chains of pipe stands of rotary drilling rigs attempts are made to hold links with tongs, pliers, and the like on fiat surfaces while the straight end is forced through an eye on the opposite end and also as the straight end is peened over. Because these links are formed of round stock and. also as they are comparatively small they are difiicult to hold on a flat surface for closing. With this thought in mind this invention contemplates an anvil having grooved sockets formed to correspond with the size of the link and the material of which the link is formed wherein with a link inserted in the socket of the anvil lateral movement thereof is prevented and the link is rigidly held.

The object of this invention is, therefore, to provide means for forming an anvil for use in the field to facilitate repairing broken chains of stands of well pipe particularly of the type used in rotary drilling rigs.

Another object of the invention is to provide an anvil for holding and positioning repair links of chains in which the anvil is designed to receive conventional links so that it is not necessary to change the design, size, or structure of the links.

Another object of the invention is to provide a repair link holding anvil which is of a simple and economical construction.

With these and other objects and advantages in view the invention embodies a link retaining anvil having a base and an upper surface with substantially U-shaped grooves in horizontally disposed sockets extended inwardly from the ends and with link holding recesses in the upper surface.

Other features and advantages of the invention will appear from the following description taken in connection with the drawing wherein:

Figure 1 is a side elevational view showing the improved anvil and illustrating the position of the link temporarily held therein for brading.

Figure 2 is a plan view of the anvil.

Figure 3 is an end elevational view of the anvil showing the link receiving groove in the U -shaped socket in one end thereof.

Referring now to the drawing wherein like reference characters denote corresponding parts the improved link holding anvil of this invention includes a base which is provided with upwardly sloping sides II and I2 that extend to an upper working face I3, and between which link holding sockets l4. and are positioned.

The socket I5 is positioned between an overhanging ledge IB. extended from the upper surface or face l3 and an extending end I! extended from the base Iii. A substantially semi-circular groove 18, as shown in dotted lines in Fig. 1, extends from the end of the ledge it, around to the inner edge I9 of a transversely disposed recess 28) and this groove is aligned with a similar semicircular groove 2| in the upper surface of the end IT. The recess is provided for receiving links, as indicated by the dot and dash lines 22 with the link 22 positioned on the repair link as indicated by the dot and dash lines 24 with the repair link positioned in the grooves 18 and 2!. With link 22 positioned in this manner the link 23 will extend downwardly from the link 22 in contact with the sloping side on which it is positioned. The difference in the length of the ledge and the extended edge of the body allows clearance for the peening of the link positioned in the groove.

The opposite end of, the anvil, which is also provided with a transversely positioned recess 25 in the lower part of the socket I4 is similar except that longitudinally disposed grooves 26 and 21, corresponding to the grooves l8 and 2!, are formed to receive a link formed of stock of a different size than that positioned in the socket It. It Will be understood that the sockets and grooves may be formed to receive stock of substantially any size desired.

The upper face 13 of the anvil is provided with elongated recesses 28 and 29 having enlarged circular openings 30 and 3|, respectively in the ends and sockets as indicated by the numerals 32 and 33 are positioned in the centers of the recesses 30 and 3 I, whereby with the ends of the repair links on which the eyes are positioned located in the recesses 28 and 29 and with the eyes in the enlarged sections 30 and 3|, the straight ends are readily inserted through the eyes with the ends extended into the sockets 32 and 33. It will be appreciated that although the enlarged openings 30 and 3| and the sockets 32 and 33 are illustrated in the ends of the recesses extended toward the center of the anvil, these parts may be turned around and extended outwardly or otherwise positioned as may be desired.

With the anvil formed in this manner the two links of the sections of the chain of a Well pipe are placed in the repair link and with the position of the repair link inserted whereas the end on which the eye is positioned is placed in the recess 29 with the eye in the enlarged section 3|, the straight end is hammered through the eye so that the end extends into the socket 33. The repair link is then turned over and placed in the grooves of the socket 15 with the links of the chain freely positioned in the recess 20 whereby the repair link is rigidly held as the extreme end of the straight end of the link is braded or peened, to positively close the link, as illustrated in Fig. 1.

By this means repair links of pipes and chains may be closed cold and the chains may be repaired in a comparatively few minutes.

It will be understood that modifications may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

A link closing anvil for holding a repair link having a straight apertured side, a loop portion and an end portion of smaller diameter than said aperture, comprising an elongated body substantially rectangular shaped in cross section and having a U-shaped socket extending inwardly from its end, the inner surface of said socket being provided with a semi-cylindrical groove for receiving a link of a chain, said body having upwardly converging sides terminating in a horizontally disposed fiat top wall, said body having a transversely disposed recess extended through the lower surface of said socket and positioned inwardly from the ends of the body, said recess having a substantial rectangular shape, said socket being defined by an upper ledge and an extended end of the body, said extended end projecting outwardly beyond said ledge, the difference in the length of the ledge and the extended end of the body allowing clearance for the peening of the link positioned in the groove, the groove in said socket extending longitudinally therethrough and being positioned intermediate the side edges thereof, said ledge being of less width than the extended end of the body, said recess being positioned below a portion of said ledge, said recess having its lower extremity terminating at a point below said groove.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 133,492 Seward Nov. 26, 1872 214,172 Miller Apr. 8, 1879 1,517,198 Deemer Nov. 25, 1924 FOREIGN PATENTS Number Country Date 25,231 Denmark Nov. 26, 1919 

